Looking on the internet deeply has found these results:

before doing this is the most popular phrase on the web.

before do this 1397,000 results on the web	before doing this 1554,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Before we do this, let me be clear... Dixon, before you do this, I have to tell you something. Before I do this... I need to see Cynthia and Macey. Before I do this, I want to know something. We have to be in International Waters before we do this. Before you do this, you should know something. Before we do this, let me be clear... I need to talk to somebody before we do this.	This man I'd never seen before was doing this horrible thing to this girl I'd never seen before. I need to go home before doing this thing. Before doing this, however, Henry wrongfully took possession of his father's dress clothes... including $20 which Uncle Randolph was negligent enough to leave in his pocket. However, before doing this we would need to carry out the necessary impact assessments of such a measure. You know I was doing this before you were. [Calvin] I need you guys to figure out who's doing this before anything worse happens. You know I was doing this before you were. I mean, it puts us right back where we were before I started doing this stuff.

before do this

1397,000 results on the web

before doing this

1554,000 results on the web

More popular!

This man I'd never seen before was doing this horrible thing to this girl I'd never seen before.
I need to go home before doing this thing.
Before doing this, however, Henry wrongfully took possession of his father's dress clothes... including $20 which Uncle Randolph was negligent enough to leave in his pocket.
However, before doing this we would need to carry out the necessary impact assessments of such a measure.
You know I was doing this before you were.
[Calvin] I need you guys to figure out who's doing this before anything worse happens.
You know I was doing this before you were.
I mean, it puts us right back where we were before I started doing this stuff.